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  4. How many of the following are amphoteric oxides? MnO , Mn 3 O 4, Mn 2 O 3, MnO 2, Mn 2 O 7

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Q. How many of the following are amphoteric oxides?
$MnO , Mn _{3} O _{4}, Mn _{2} O _{3}, MnO _{2}, Mn _{2} O _{7}$

The p-Block Elements - Part2

Solution:

For oxides of d-block, acidic character increases with increase in oxidation state of the elements. Hence, $MnO$ is a basic oxide. $Mn _{3} O _{4}, Mn _{2} O _{3}$ and $MnO _{2}$ are amphoteric oxides while $Mn _{2} O _{7}$ is an acidic oxide.